Selective tandem pump mounting



Dec. 11, 1962 E. A. HUSNEY 3,067,687

SELECTIVE TANDEM PUMP MOUNTING Filed June 16, 1959 4 Sheets-Sheet 1 Dec. 11, 1962 E. A. HUSNEY SELECTIVE TANDEM PUMP MOUNTING 4 SheetsSheet 3 Filed June 16, 1959 Dec. 11, 1962 E. A. HUSNEY 3,067,687

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United States Patent 3,067,687 .SELECTIV E TANDEM PUMP MOUNTING Edward A. -Husney, Parma Heights, Ohio, assignor t0 ThompsonRamo Wooldridge, Iuc., Clevelaniphio, a corporation of ()hio 'Filed June 16, 1959, SenNo. 320,677

2 Claims. (Cl. 103 -4} This invention relates generally to pumps and more particularly to a selective tandem pump mounting'wherein a casing arrangement enables the 'user to achieve plural combinations from a single manifold mounting, for example, on a tractor transmission where it may be desired to combine an implement pump together with a power assisting pump such as a power steering'pump, or wherein it may be desired to use the implement pump alone or the power assisting pump alone'j It is an object of the present invention to, provide an improved pump mounting.

Another object of the present invention is to provide a casing arrangement which alfords plural combinations from a single manifold mounting.

A further object of the present invention is to provide a plural combined pump wherein the individual pumping units may be individually employed and wherein the remaining pumping units, if not used, function as dummy mounting means.

Another object of the present invention is to provide a casing arrangement for a plural pump wherein less than the total number of pumping units may be used-while the remaining pumping units function as flow conduits for the operating pump unit.

Yet another object of the present invention is to provide a piggy-back pump for use on a tractor.

Many other features, advantages and additional objects of the present invention will become manifest to those versed in the art from a study of the detailedv description which follows and the accompanying sheets of drawings in which a preferred structural embodiment of a tandem pump mounting incorporating the principles of the present invention is shown by way of illustrative example.

On the drawings:

FIGURE 1 is a fragmentary view showing a tandem pump combination carried on a mounting plate and in position for installation into the transmission cavity of a tractor;

FIGURE 2 is a view generally similar toFIGURE l but showing the completed installation;

FIGURE 3 is an elevational view of the'pump construction with the mounting plate removed and with parts broken away and with parts shown in cross-section to illustrate additional details of construction;

FIGURE 4 is an end elevational view of the pump construction shown in FEGURE 3 and with partsshown in cross-section to illustrate details of the iiow control apparatus associated with the power steering pump unit incorporated in the tandem pump assembly;

FIGURE 5 is an end elevational view showing the end of the pump construction opposite the end view of FIGURE 4;

FIGURE 6 is a cross-sectional view taken generally on lineVi-VI of FIGURE 5;

FIGURE 7 is a plan elevational view of the pump of FIGURE 6 with parts broken out and with parts shown in cross-section to illustrate the use of the power steeringpump only; and

FIGURE 8 is a cross-sectional view similar to FIGURE '6 but showing the use of the implement pump only.

As shown on the drawings: Although it will be understood that the present inven- 3,657,687 Patented Dec. 11, 1962 tion is of general utility wherever a tandem mounting is desired-for plural pump units and-wherever a-casing arrangement is desired to afford selective combinations of either or both of two separate pumping units, a particularly useful application of the principles of thepresent invention is made in a tandem pump mounting afiording combinations from a single manifold mounting on a tractor transmission and wherein the dual pumping unitsinclude a so-called implement pump for supplying pressurized fluid to implements associated with the tractor and a power assisting pump such as is used to provide'pressuriz ed 'iluid to a power assisting device such as a power steering mechanism.

' There is shown in FIGURE 1, therefore, a transmissionhousing of the power plant of a tractor on which stormed a mounting flange l1 surrounding an opening '12 leading into the transmission cavity 13. A power take-off from the transmission is shown provided by a flange 2d of the mounting plate 21 is provided with a corresponding plurality of apertures 23 matched to the threaded apertures 19 whereupon the pump combination ZZmay be readily installed in the transmission cavity 13 by fastening a plurality of bolts 24 through the apertures 23 and into the threaded openings H.

The pumpcombination 22 is provided with a mounting pad 26 having a plurality of threaded apertures 27 formed therein and receiving mounting bolts 28, thereby to place the pump combination 22 in firm assembly with the 'mounting plate 21.

An inlet adapter 29 is received in and connected to the suction port '18, thereby establishing flow communication between means forming an inlet port 38 in an inlet boss 31 formed on a housing member 32 of the pump combination 22.

As is clearly shown in FIGURES 3 and 6, the housing "32 is one section of a multi-part pump housing or pump casing, each one ofwhich will be separately identified for greater clarity in understanding the various combinatons which are used.

Thus, in the cross-sectional view of FIGURE 6 wherein both pumping units of the tandem pump arrangement are shownin operative relation, the pumping unit sometimes referred to herein as the implement pump is indicated on the left-hand side of the drawing and is indicated generally by the reference character A, while the pumping unit sometimes referred to herein as the power steering pump is indicated generally at B on the righthand side of the pump. The housing member 32, therefore, comprises a housing for the pumping unit A and has formed therein a pumping chamber 33 in which is received amovable bearing end plate means 34 for engaging and sealing against the adjoining side face of rotary fluid displacement means including a driver gear \36 and a driven gear 37 in meshing relationship with one another and adapted to pressurize fluid supplied to the inlet port 30 via an inlet passage 38 (FIGURE 7)-to an outlet 39 (FIGURE '2) via an outlet passage 40 (FIG- URE 3) formed in the housingSZ. As shown in FIG- URE 3, theoutlet passage 49 intersects the mounting pad 26 at a flanged opening 41 which facilitates attachment thereto of the means forming the outlet port 39 which actually comprises a conduit connection by means of which the pressurized fluid from the pump unit A may be discharged through conduit 42 to a point of utilization such as the various implements associated with a tractor.

The housing 32 also contains end plate means indicated at 43 for engaging and sealing against the adjoining side face of the opposite sides of the gears 36 and 37 and a reduced bore section of the housing shown at 44 contains a bearing sleeve 46 effective to journal and sup port a shaft extension 47 on one side of the gear 36, while a reduced bore portion 48 formed in the housing 32 contains a bearing sleeve 49 to journal and support a shaft extension 51) of the driven gear 37.

A shaft extension 51 on the opposite side of the driver gear 36 is rotatably journaled in the bearing surface of the bearing end plate means 34 and extends outwardly of the pump through a cover member 52 connected to the housing 32 to provide a coupling portion 53 adapted to meshingly engage the gear 14 and thereby to be engaged in driven relationship with the power take-off of the tractor transmission.

The driven gear 37 also includes an additional shaft extension 54 journaled in the bearing surfaces of the bearing end plate means 34 in turn received within a recess 56 formed in the cover member 52.

The housing 32 is particularly characterized by the formation thereon of a flat wall 57. The pump unit B is connected to the pump unit A at the wall 57. More specifically, the pump unit B includes a casing 60 having formed therein a pumping chamber 61 in which is rotatable a driving gear 62 meshing with a driven gear 63. The casing member includes end plate means 64 for engaging and sealing against the adjoining side face of the gears 62 and 63 and also providing a bearing surface for journaling shaft extensions 66 and 67, respectively provided for the driver gear 62 and the driven gear 63.

As a part of the casing or housing of the pump unit B there is provided an element which shall be referred to as a cover member 68 having a first fiat surface 69 which not only abuts and engages against the casing 60, but will also serve to sealingly engage the other side faces of the gears 61 and 63. The member 68 further provides bearing surfaces at 70 to journal a shaft extension 71 on the driver gear 62 and at 72 to journal a shaft extension 73 formed on the driven gear 63.

The shaft extension 71 of the driver gear 62 is particularly characterized by the formation thereon of a stub shaft 74 having a splined portion 75 interconnected with a complementary splined portion 76 formed in a recess '77 in the shaft extension 47 of the driver gear 36. Thus, the driver gears 36 and 62 are coupled together and both pump units A and B are driven through a common connection with the power take off 14.

If it is desired to operate only the pump unit A, the entire pump unit B may be readily removed from the pump combination 22 in the manner exemplified in FIGURE 8. Thus, the member 66 and the casing 69 are disconnected and bodily removed from the housing 32 whereupon a cover member it is substituted for the pumping unit B. The cover member 81)- has a flat surface 81 coextensive in area with the wall 57 of the housing 32 and is appropriately apertured so that the cover member 86 may be placed in firm assembly with the housing 32 by a plurality of fastening means indicated at 82.

If, in the alternative, it is desired to use only the pump unit B, then an arrangement such as exemplified by FIGURE 7 can be provided and in which the pump unit A is merely a dummy with the housing 32 functioning as a conduit means.

In this regard, it will be noted upon referring to FIGURE 7 that the housing 32 has formed therein a passage 83 which intersects at one end the inlet port 34 and which intersects at its other end the wall 57, thereby to lie in register with a correspondingly sized passage 84 formed in the cover member 68 and which passage 84 extends from the Wall 57 to the surface 69 of the cover member 63 where it lies in register with an inlet passage 86 formed in the casing 60 of the pump unit B and communicating with the pump inlet of the pump ing chamber 61.

As is well known, a pump in a power assisting system is frequently used in association with a flow con trol means, thereby to deliver a constant flow of fluid to the point of utilization. According to the present invention, fluid pressurized by the pump unit B is discharged from the pump outlet into a flow control means indicated generally at 87. The flow control means 87 is formed in a boss 83 formed on one side of the casing 60 and having a flow control passage 39 recessed at longitudinal spaced points indicated at 96 and 91 with a land 92 therebetween so that a movable spool-type valve member 93 can be reciprocated therein for control purposes. The spool valve 93 has longitudinally spaced recesses formed therein as at 94 and 96 with a valve land 97 therebetween. A plurality of radial openings 98 are formed in the spool valve 93 and communicates pump-generated pressures from the recess 94 to a center passageway 99 formed inside of the spool valve 93 and communicating with a discharge passage 100 formed in the casing 60. The passage 10% intersects the plane of juncture between the cover member 68 and the casing 69 and is in register with one end of a passage 101 formed in the casing member 68. The other end of the passage 101 lies in register with a passage 192 formed in the housing 32 at the wall 57, which passage 162 discharges into an outlet port 1193 to which may be connected a conduit coupling 104 (FIGURE 2) though the discharge is directed to the line of a power assisting device such as a power steering mechanism via a con duit 106.

In its regulating function, the control means 87 operates to by-pass fluid at pump discharge pressure from the recess 94 into the recess 91 when the spool valve 93 moves away from a stop member 167 forming a closure at one end of the bore 89 and retained in place by a lock ring 108 fitted in a groove 109. Thus, by-passed fluid enters a passageway 110 formed in the casing 60, which passageway 110 registers with an adjoining passageway 111 formed in the cover member 68 and communicating with a pump inlet zone 112 formed at the wall 57 between the cover member 68 and the housing 32 (see FIGURE 3).

If the pump unit B is to be used only, no rotary fluid displacement means need be supplied for the pump unit A and, accordingly, a shaft member 51a having a coupling portion 53a is provided and extends through the pumping chamber 33 to provide a splined coupling portion 113 closely spaced to the splined coupling portion 75 of the stub shaft 74 on the end of the shaft extension 71 of the driver gear 62. There is then provided a coupling sleeve 114 which is internally splined as at 116 thereby to interconnect the splined portion 113 and the splined portion 75 to rotatably drive the driver gear 62 via the shaft member 51a. With such arrangement, as illustrated in FIGURE 7, the pump unit A is merely a dummy and the housing 32 functions as a conduit means for conducting inlet fluid to the pump unit B through the inlet passageway 30, 83, 84, 86 and also to the pump discharge port via the passageway 166, 161, 102, 163, 104, 106. A substitute dummy could also be used to cut down expense of supplying an actual pump housing 32.

The present invention provides, therefore, a casing arrangement which affords plural combinations from a single manifold mounting on a tractor transmission.

When both the implement and power steering pumps are provided for the tractor, the two pump casings are simply bolted together with the implement pump casing serving as a conduit for the power steering pump. When the implement pump is used alone, the power steering pump casing is removed whereupon the implement pump casing is simply closed with a cover plate. When the power steering pump is used alone, the implement pump casing is not equipped with pumping means and forms a housing or dummy support for the power steering pump.

Although various minor modifications might be suggested by those versed in the art, it should be understood that I Wish to embody within the scope of the patent warranted herein all such modifications are reasonably and properly come within the scope of my contribution to the art.

In claim as my invention: 1. A pump, comprising, a multi part pump casing including a first housing member having formed therein an inlet port, a pumping chamber, an inlet passage extending from said inlet port to the inlet side of said pumping chamber, an outlet port, an outlet passage connected to said outlet port and extending from the outlet side of said pumping chamber, a second housing member having formed therein a pumping chamber, an inlet passage communicating with the inlet side of said pumping chamber, a discharge passage communcating with the outlet side of said pumping chamber, said first and second housing members having confronting transverse flat walls, and a flat cover member insertable between said confronting fiat walls and being connected in firm assembly with said housing members,

said first housing member and said cover member having a passage formed therein intersecting at one end said inlet port in said first housing member and connected at its other end to said inlet passage in said second housing member, said first housing member having a second outlet port formed therein and having together with said cover member a passage interconnecting said second outlet port with said discharge pas sage in said second housing member, whereby rotary fluid displacement means can be placed in said pumping chambers of said first housing member to form pump unit A and in said second housing member to form pump unit B, selectively, to form a tandem pump unit A--B or a single pump unit B operable alone with said first housing member functioning as a dummy mounting means.

2. A pump as defined in claim 1 and flow control means in said discharge passage of said second housing member, thereby to deliver a constant flow of fluid to said second outlet port for utilization of said pump unit B as a ,constant flow pumping source.

References Cited in the file of this patent UNITED STATES PATENTS 796,724 Hewitt Aug. 8, 1905 1,750,170 Frisch Mar. 11, 1930 2,103,971 Goldsmith Dec. 28, 1937 2,533,320 Hull Dec. 12, 1950 2,571,105 Bicket et a1. Oct. 16, 1951 2,634,686 Schmitter Apr. 14, 1953 2,765,746 Omon Oct. 9, 1956 2,818,023 Lundstrom Dec. 31, 1957 2,881,704 Murray Apr. 14, 1959 2,902,935 Dinnison et a1. Sept. 8, 1959 2,931,308 Dlugos Apr. 5, 1960 2,941,473 Lorenz June 21, 1960 2,984,186 Livermore et al. May 16, 1961 

